CN111478213A - Semiconductor refrigeration and dehumidification device and method for ring main unit - Google Patents

Abstract

A semiconductor refrigeration and dehumidification device and method for a ring main unit. The technical field of power equipment matching is related, and particularly relates to a semiconductor refrigeration and dehumidification method and device for a ring main unit. The semiconductor refrigeration dehumidification method and device which are realized intelligently through the microcontroller dehumidification device and the control method, are free of frosting, are convenient to power up in a cabinet, are small in size, convenient to install and strong in instantaneity are provided. The hot end radiating fins penetrate through the back sun surface of the herringbone roof and extend out of the herringbone roof, radiating fans are arranged on the hot end radiating fins, cold end radiating fins are further arranged on the semiconductor refrigerator, and condensing fans are arranged on the cold end radiating fins. The invention utilizes the information obtained by the feedback of the refrigerator controller, outputs signals to the semiconductor refrigerator for refrigeration and the resistance wire heater on the cold-end radiating fin for heating and defrosting, is intelligent and does not frost, and the photovoltaic power generation device is arranged to facilitate the power taking in the cabinet.

Description

Semiconductor refrigeration and dehumidification device and method for ring main unit

Technical Field

The invention relates to the technical field of power equipment matching, in particular to a semiconductor refrigeration and dehumidification method and device for a ring main unit.

Background

When cooling or air are moist, condensation is easy to generate in the ring main unit, accumulated water is generated in the ring main unit in serious conditions, the condition can lead to the reduction of the insulation resistance of the alternating current-direct current loop to the ground, the protection is refused to be operated or mistakenly operated if the resistance is light, short circuit is caused if the resistance is heavy, equipment is damaged, and the safe operation of a power grid is seriously threatened. The traditional dehumidification method is to install an electric heater in a cabinet to heat the interior of equipment, and reduce the relative humidity in the cabinet by improving the temperature in the cabinet, so that the method can play a role in removing dampness to a certain extent, but cannot fundamentally solve the problem of dampness; the anti-condensation device adopts a semiconductor refrigeration technology, reduces the relative humidity in the cabinet by locally manufacturing condensation conditions, and directly discharges condensed water.

For this reason, researchers in the field proposed "application research of novel semiconductor condensation dehumidifier in 10KV ring main unit", No. 1, power world, author in 2017: published research documents such as Chengshiping, Li Xiaozhou and Li Zhuan. This document provides a semiconductor condensation dehumidifier for solving the problem that outdoor looped netowrk cabinet frosted. But the key technology and difficulty of the current product are as follows: firstly, how to control the semiconductor refrigeration to discharge the moisture in the condensed air out of the cabinet and prevent the moisture from being condensed into frost; secondly, how to get electricity to the dehumidifier in the outdoor ring main unit; thirdly, how to make small, the power is little equipment to install in the looped netowrk cabinet.

Disclosure of Invention

Aiming at the problems, the invention provides a semiconductor refrigeration dehumidification method and a device which are realized by a microcontroller dehumidification device and a control method, have the advantages of intellectualization, no frosting, convenient power taking in a cabinet, small volume, convenient installation and strong real-time performance.

The technical scheme of the invention is as follows: a semiconductor refrigerator device and a refrigerator controller are arranged in the ring main unit, the semiconductor refrigerator device comprises a semiconductor refrigerator, a hot-end radiating fin, a cold-end radiating fin, a radiating fan, a condensing fan and a resistance wire heater, the refrigerator controller comprises an integrated temperature and humidity sensor, a keyboard circuit, a conditioning circuit, an Internet of things communication interface, a microcontroller and a frost sensor,

the frost sensor is fixedly connected to the cold-end cooling fin, the frost sensor adopts a CDC chip detection circuit, the CDC chip adopts a sigma-delta capacitance digital converter AD7746, and an output signal of the frost sensor is connected with the microcontroller through an I2C bus to realize the detection of frost condensation of a dehumidifier of the cold end of the semiconductor refrigerator;

the resistance wire heater is fixedly arranged on the cold-end radiating fin and is connected with the microcontroller through a resistance wire heater driving circuit, and an I/O port of the microcontroller outputs a control signal to drive the resistance wire wound on the cold-end radiating fin of the semiconductor refrigerator to generate heat.

The ring main unit is provided with a herringbone roof, the semiconductor refrigerator is arranged on the inner surface of the sunny side of the herringbone roof of the ring main unit,

the semiconductor cooler has a hot side heat sink and a cold side heat sink,

the hot end radiating fins penetrate through the back sun surface of the herringbone roof and extend out of the herringbone roof, the hot end radiating fins are provided with radiating fans,

the semiconductor refrigerator is also provided with a cold end radiating fin, and a condensing fan is arranged on the cold end radiating fin.

The solar photovoltaic power generation system is characterized in that a photovoltaic power generation device is arranged on the sunny side of the herringbone roof of the ring main unit, and the photovoltaic power generation device comprises a solar photovoltaic cell panel, a photovoltaic power generation DC/DC conversion device, a controller and an energy storage battery.

The ring main unit is also provided with an audible and visual alarm.

A semiconductor refrigeration dehumidification method for a ring main unit is carried out according to the following steps:

1) initializing the system;

2) collecting a temperature value inside the ring main unit;

3) judging whether the acquired temperature value is higher than 50 ℃ or lower than 0 ℃, stopping refrigeration if the temperature value is higher than 50 ℃ or lower than 0 ℃, giving out temperature line-crossing acousto-optic alarm, and returning to the step 2);

4) collecting a frost forming value output by a frost forming sensor if the temperature value is between 50 ℃ and 0 ℃;

5) judging whether the frost value is less than 1, if so, starting a resistance wire to heat and defrost, and returning to the step 2);

6) if the humidity value is not less than 1, acquiring the humidity value output by the humidity sensor;

7) if the humidity value is larger than 75%, starting the semiconductor refrigerator, and returning to the step 2);

8) if the humidity value is not more than 75%, judging whether the humidity value is less than 25%; if less than 25%, the semiconductor refrigerator is stopped, and the step 2) is returned, and if not less than 25%, the step 6) is returned.

The invention is provided with a semiconductor refrigerator device and a refrigerator controller, firstly, the semiconductor refrigerator is started to refrigerate according to whether the temperature value is in the application range or not through the temperature value inside the ring main unit collected by an integrated temperature and humidity sensor in the refrigerator controller, after refrigeration measures are taken, the degree of frost condensation on a cold-end radiating fin of the refrigerator is tested through a frost condensation detection circuit arranged inside the refrigerator, if the frost condensation value reaches a defrosting rated value, defrosting on the cold-end radiating fin is carried out through the defrosting circuit arranged inside the refrigerator, if the frost condensation value does not reach the rated value, the humidity value is collected through the integrated temperature and humidity sensor, and the semiconductor refrigerator is started according to whether the humidity value is in the application range or not. Generally, the refrigerator control system utilizes information obtained by feedback of the refrigerator controller to output signals to the semiconductor refrigerator for refrigeration and the resistance wire heater on the cold-end radiating fin for heating and defrosting, and is intelligent and free of frosting, and the photovoltaic power generation device is arranged to facilitate power taking in the cabinet.

Drawings

Figure 1 is a schematic view of the installation of a dehumidifying device on a ring main unit,

figure 2 is a block diagram of a control system of a semiconductor refrigeration and dehumidification device,

figure 3 is a flow chart of a semiconductor refrigeration dehumidification method,

FIG. 4 is a schematic diagram of a frost detection circuit of the semiconductor refrigeration and dehumidification device,

FIG. 5 is a schematic diagram of a heating and defrosting circuit of the semiconductor refrigeration dehumidifier;

in the figure, 1 is a semiconductor refrigerator, 2 is a cooling fan, 3 is a cold-end cooling fin, 4 is a condensing fan, 5 is a refrigerator controller, 6 is a solar photovoltaic cell panel, 7 is a photovoltaic power generation DC/DC conversion, controller and energy storage battery, 8 is an integrated temperature and humidity sensor, 9 is a microcontroller, 10 is a frost condensation sensor, 11 is a conditioning circuit, 12 is an audible and visual alarm, 13 is a resistance wire heater, 14 is a keyboard circuit, and 15 is an internet of things communication interface.

Detailed Description

The invention is described in detail with reference to the accompanying drawings 1-5, a semiconductor refrigerator device and a refrigerator controller 5 are arranged in a ring main unit, the semiconductor refrigerator device comprises a semiconductor refrigerator 1, a hot end radiating fin, a cold end radiating fin 3, a radiating fan 2, a condensing fan 4 and a resistance wire heater 13, the refrigerator controller 5 comprises an integrated temperature and humidity sensor 8, a keyboard circuit 8, a conditioning circuit 11, an internet of things communication interface 15, a microcontroller 9 and a frost sensor 10,

as shown in fig. 2, the integrated temperature and humidity sensor 8 is connected with the microcontroller 9 to realize the collection of the temperature and the humidity in the ring main unit, the internet of things communication interface 15 is connected with the microcontroller 9 to realize the communication of various internet of things interfaces, the keyboard circuit 8 is connected with the microcontroller 9 to realize the system reset and the setting of the upper and lower temperature and humidity limit values.

The frost sensor 10 is fixedly connected to the cold-end cooling fin 3, the frost sensor 10 is connected with the microcontroller 9 through the conditioning circuit 11, as shown in fig. 4, the frost sensor 10 adopts a CDC chip detection circuit (the patent name is a capacitive refrigerator frost sensor detection circuit, the patent number is Z L201721137639. X), the CDC chip adopts a sigma-delta capacitance digital converter AD7746, and the output signal of the frost sensor 10 is connected with the microcontroller 9 through an I2C bus, so that the frost on the cold-end dehumidifier of the semiconductor refrigerator 1 is detected;

the resistance wire heater 13 is fixedly arranged on the cold-end radiating fin 3, the resistance wire heater 13 is connected with the microcontroller 9 through a resistance wire heater driving circuit, an I/O port of the microcontroller 9 outputs a control signal to drive the resistance wire wound on the cold-end radiating fin 3 of the semiconductor refrigerator 1 to generate heat, and the defrosting function of frost condensation on the cold-end radiating fin of the semiconductor refrigerator is realized, and the circuit principle is shown in figure 5.

The ring main unit is provided with a herringbone roof, the semiconductor refrigerator 1 is arranged on the inner surface of the herringbone roof of the ring main unit,

the semiconductor cooler 1 has a hot side heat sink and a cold side heat sink 3,

the hot end radiating fin penetrates through the back sun surface of the herringbone roof and extends out of the herringbone roof, the radiating fan 2 is arranged on the hot end radiating fin, and the microcontroller 9 outputs signals to drive the radiating fan 2 through the driving circuit so as to realize hot end radiating treatment of the semiconductor refrigerator.

Semiconductor cooler 1 still is equipped with cold junction fin 3, is equipped with condensing fan 4 on the cold junction fin 3, and microcontroller 9 output signal passes through drive circuit drive condensing fan 4, realizes the dehumidification of semiconductor cooler 1's cold junction fin 3 and handles.

A photovoltaic power generation device is arranged on the sunny side of the herringbone roof of the ring main unit, and the photovoltaic power generation device comprises a solar photovoltaic cell panel 6, a photovoltaic power generation DC/DC conversion device, a controller and an energy storage battery 7. The power supply function to the internal circuit is realized.

The ring main unit is further provided with an audible and visual alarm 12, when the temperature and humidity value collected by the integrated temperature and humidity sensor 8 exceeds the limit range, the information is output to the audible and visual alarm 12 through the microcontroller 9 to give an alarm, and the function of alarming the temperature and humidity value of the ring main unit when the temperature and humidity value exceeds the limit range is achieved.

A semiconductor refrigeration dehumidification method for a ring main unit is carried out according to the following steps:

1) initializing the system;

2) collecting a temperature value inside the ring main unit;

3) judging whether the acquired temperature value is higher than 50 ℃ or lower than 0 ℃, stopping refrigeration if the temperature value is higher than 50 ℃ or lower than 0 ℃, giving out temperature line-crossing acousto-optic alarm, and returning to the step 2);

4) collecting a frost forming value output by a frost forming sensor if the temperature value is between 50 ℃ and 0 ℃;

5) judging whether the frost value is less than 1, if so, starting a resistance wire to heat and defrost, and returning to the step 2);

6) if the humidity value is not less than 1, acquiring the humidity value output by the humidity sensor;

7) if the humidity value is larger than 75%, starting the semiconductor refrigerator, and returning to the step 2);

8) if the humidity value is not more than 75%, judging whether the humidity value is less than 25%; if less than 25%, the semiconductor refrigerator is stopped, and the step 2) is returned, and if not less than 25%, the step 6) is returned.

Claims (5)

1. A semiconductor refrigeration and dehumidification device for a ring main unit is characterized in that a semiconductor refrigerator device and a refrigerator controller are arranged in the ring main unit, the semiconductor refrigerator device comprises a semiconductor refrigerator, a hot-end radiating fin, a cold-end radiating fin, a radiating fan, a condensing fan and a resistance wire heater, the refrigerator controller comprises an integrated temperature and humidity sensor, a keyboard circuit, a conditioning circuit, an Internet of things communication interface, a microcontroller and a frost condensation sensor,

the frost sensor is fixedly connected to the cold-end cooling fin, the frost sensor adopts a CDC chip detection circuit, the CDC chip adopts a sigma-delta capacitance digital converter AD7746, and an output signal of the frost sensor is connected with the microcontroller through an I2C bus to realize the detection of frost condensation of a dehumidifier of the cold end of the semiconductor refrigerator;

the resistance wire heater is fixedly arranged on the cold-end radiating fin and is connected with the microcontroller through a resistance wire heater driving circuit, and an I/O port of the microcontroller outputs a control signal to drive the resistance wire wound on the cold-end radiating fin of the semiconductor refrigerator to generate heat.

2. The semiconductor refrigerating and dehumidifying device for ring main unit as claimed in claim 1, wherein the ring main unit has a gable roof, the semiconductor refrigerator is mounted on an inner surface of the gable roof of the ring main unit,

the semiconductor cooler has a hot side heat sink and a cold side heat sink,

the hot end radiating fins penetrate through the back sun surface of the herringbone roof and extend out of the herringbone roof, the hot end radiating fins are provided with radiating fans,

the semiconductor refrigerator is also provided with a cold end radiating fin, and a condensing fan is arranged on the cold end radiating fin.

3. The semiconductor refrigerating and dehumidifying device for ring main units as claimed in claim 2, wherein a photovoltaic power generation device is disposed on a sunny side of a gable roof of the ring main unit, and the photovoltaic power generation device comprises a solar photovoltaic cell panel, a photovoltaic power generation DC/DC conversion device, a controller and an energy storage battery.

4. The semiconductor refrigerating and dehumidifying device for ring main units as claimed in claim 1, wherein the ring main unit is further provided with an audible and visual alarm.

5. A semiconductor refrigeration dehumidification method for a ring main unit is characterized by comprising the following steps:

1) initializing the system;

2) collecting a temperature value inside the ring main unit;

3) judging whether the acquired temperature value is higher than 50 ℃ or lower than 0 ℃, stopping refrigeration if the temperature value is higher than 50 ℃ or lower than 0 ℃, giving out temperature line-crossing acousto-optic alarm, and returning to the step 2);

4) collecting a frost forming value output by a frost forming sensor if the temperature value is between 50 ℃ and 0 ℃;

5) judging whether the frost value is less than 1, if so, starting a resistance wire to heat and defrost, and returning to the step 2);

6) if the humidity value is not less than 1, acquiring the humidity value output by the humidity sensor;

7) if the humidity value is larger than 75%, starting the semiconductor refrigerator, and returning to the step 2);

8) if the humidity value is not more than 75%, judging whether the humidity value is less than 25%; if less than 25%, the semiconductor refrigerator is stopped, and the step 2) is returned, and if not less than 25%, the step 6) is returned.

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